Quote:
Originally Posted by Average Joe
A couple other things that may help.
If submerged at idle-speed in rough seas, I almost always sink away from periscope-depth. It helps to keep moving at slow speed, maybe 2/3-knots, and even then it's difficult to get a good view from the periscope. The conning tower will pop-out of the water from time to time.
Another thing that seems to help is pressing the 'Periscope Depth' key (P) every 30 seconds or so.
Your milage may vary 
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Same here. In rough seas, I never stop, I always set 1knt so that I manage to stay right around periscope depth. Nothing more annoying than having lined up just right for that perfect shot into a convoy then to have it ruined by the fact your helm-dorks can't seem to keep you at the correct depth.
I also agree that having all your WO's with Helm qualification does seem to help, but that could be subjective, I can't prove it.